Publication detail

Influence of geometric simplifications on stresses and strains in aneurysm model.

DĚTÁK, M. BURŠA, J. ZEMÁNEK, M.

Original Title

Influence of geometric simplifications on stresses and strains in aneurysm model.

English Title

Influence of geometric simplifications on stresses and strains in aneurysm model.

Type

conference paper

Language

en

Original Abstract

The paper deals with a possibility of replacing real cross sections of abdominal aortic aneurysm (AAA) by simplified cross sections with a circular or elliptic shape and with the influence of these simplifications on results obtained by FEM solutions. The shapes of AAA cross sections are obtained from sequenced CT frames (scans??) of a real patient. Naturally, the assumption of simplified cross section shapes smoothes down many local shape variations. To assess the influence of this effect on the calculated stress-strain states, a comparison of two models has been carried out. First, the analysis was realized with an real geometry model, created from the original, unchanged CT frames of the AAA. Second, a geometric model was created from the simplified CT frames with circular or elliptical shape of the cross sections. The same FE stress-strain analysis was carried out in both cases with a hyperelastic constitutive model. Comparison of results is then made via maximal principal stresses and strains in the AAA wall.

English abstract

The paper deals with a possibility of replacing real cross sections of abdominal aortic aneurysm (AAA) by simplified cross sections with a circular or elliptic shape and with the influence of these simplifications on results obtained by FEM solutions. The shapes of AAA cross sections are obtained from sequenced CT frames (scans??) of a real patient. Naturally, the assumption of simplified cross section shapes smoothes down many local shape variations. To assess the influence of this effect on the calculated stress-strain states, a comparison of two models has been carried out. First, the analysis was realized with an real geometry model, created from the original, unchanged CT frames of the AAA. Second, a geometric model was created from the simplified CT frames with circular or elliptical shape of the cross sections. The same FE stress-strain analysis was carried out in both cases with a hyperelastic constitutive model. Comparison of results is then made via maximal principal stresses and strains in the AAA wall.

Keywords

abdominal aorta, aneurysm, CT frames, model geometry, finite element analysis

RIV year

2009

Released

10.02.2010

Publisher

Springer

Location

Munich, Germany

ISBN

978-3-642-03897-6

Book

IFMBE Proceedings

Pages from

529

Pages to

532

Pages count

4

Documents

BibTex


@inproceedings{BUT29752,
  author="Michal {Děták} and Jiří {Burša} and Miroslav {Zemánek}",
  title="Influence of geometric simplifications on stresses and strains in aneurysm model.",
  annote="The paper deals with a possibility of replacing real cross sections of abdominal aortic aneurysm (AAA) by simplified cross sections with a circular or elliptic shape and with the influence of these simplifications on results obtained by FEM solutions. The shapes of AAA cross sections are obtained from sequenced CT frames (scans??) of a real patient. Naturally, the assumption of simplified cross section shapes  smoothes down many local shape variations. To assess the influence of this effect on the calculated stress-strain states, a comparison of two models has been carried out. First, the analysis was realized with an real geometry model, created from the original, unchanged CT frames of the AAA. Second, a geometric model was created from the simplified CT frames with circular or elliptical shape of the cross sections. The same FE stress-strain analysis was carried out in both cases with a hyperelastic constitutive model. Comparison of results is then made via maximal principal stresses and strains in the AAA wall.",
  address="Springer",
  booktitle="IFMBE Proceedings",
  chapter="29752",
  howpublished="electronic, physical medium",
  institution="Springer",
  year="2010",
  month="february",
  pages="529--532",
  publisher="Springer",
  type="conference paper"
}